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Online Edition: "Specifications for Flavourings"

Flavouring DL-Methionine
Synonym(s) DL-2-Amino-4-(methylthio)butyric acid;2-Amino-g-(methylthio)butyric acid;2-Amino-4-(methylthio)butanoic acid
Latest JECFA evaluation 2004 (Session 63)
Status of specification Full
Chemical name 2-Amino-4-(methylthio)butaoic acid
JECFA number 1424
CAS number 59-51-8
FEMA number 3301
COE number
FLAVIS number 17.014
Molecular weight 149.21
Chemical formula C5H11O2NS
Physical form/odour White crystalline platelets or powder; Characteristic aroma
Solubility Soluble in water; Insoluble in ether
Solubility in ethanol Soluble
Boiling point (°C)
Assay min % 98%
Acid value max
Refractive index
Specific gravity
Other requirements mp: 281°
ID Test MS